211309073 has 4 divisors (see below), whose sum is σ = 220496448. Its totient is φ = 202121700.

The previous prime is 211309061. The next prime is 211309081. The reversal of 211309073 is 370903112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-211309073 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (211359073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4593653 + ... + 4593698.

It is an arithmetic number, because the mean of its divisors is an integer number (55124112).

Almost surely, 2^211309073 is an apocalyptic number.

211309073 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

211309073 is a deficient number, since it is larger than the sum of its proper divisors (9187375).

211309073 is an equidigital number, since it uses as much as digits as its factorization.

211309073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9187374.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 211309073 is about 14536.4738846806. The cubic root of 211309073 is about 595.6247215232.

It can be divided in two parts, 21130 and 9073, that added together give a palindrome (30203).

The spelling of 211309073 in words is "two hundred eleven million, three hundred nine thousand, seventy-three".